# Relationship history for MSHA mine 0504755

Current hierarchy: **Roberta  McLeod → Rough Edges, Inc. → South Boone Quarry**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Rough Edges, Inc. → South Boone Quarry; 2002-09-18 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Roberta  McLeod → South Boone Quarry; 2002-09-18 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Roberta  McLeod → Rough Edges, Inc.; 2002-09-18 to current/open; source msha-controller-operator-history